Well you can't really say it isn't working...some newer games dont work well in no$gba, maybe coz its been a long time since it was updated. eg. PMD: explorers of sky (i think)
That's weird... I heard that iDeas is much more demanding on processor so it is slower then No$GBA...I say that the iDeas (or something that is spelled like that) is the best. The No$GBA doesn't run ROMs as fast for me.